A dew shield is a device used to prevent moisture or condensation buildup on the lens of a camera or telescope collector during cool night observations. The dew shield either shades the lens or provides a small amount of warm air directly in front of the lens or collector to prevent dew from collecting on the element. Some dew shields work by using a heating element that keeps the objective lens warm enough to keep the dew from collecting.
Famous quotes containing the words dew and/or shield:
“Keep up your bright swords, for the dew will rust them.”
—William Shakespeare (1564–1616)
“Vice is its own reward. It is virtue which, if it is to be marketed with consumer appeal, must carry Green Shield stamps.”
—Quentin Crisp (b. 1908)